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A meteor appears when a chunk of metallic or stony matter called a meteoroid enters the. They are a variety of rocks composed of broken fragments of minerals or rock cemented together by finer material. A meteoroid is a small rock or particle of debris in our solar system. Meteoroids that reach the Earth are called meteorites. They contain big, beautiful olive-green crystals – a form of magnesium–iron silicate called olivine embedded entirely in metals. There are two different types of stony-iron meteorites 1. They range in size from large fragments of asteroids or comets to extremely small micrometeoroids. They contain equal parts of iron-nickel metal and silicate minerals. Meteoroid: the solid object that creates the streak. When a meteoroid survives a trip through the atmosphere and hits the ground, it’s called a meteorite. Stony-iron are considered some of the most beautiful meteorites. When meteoroids enter Earth’s atmosphere (or that of another planet, like Mars) at high speed and burn up, the fireballs or shooting stars are called meteors. This type of structure is very similar to terrestrial planets ( Mercury, Venus, Mars, and Earth), which also have metallic cares. Sometimes they have an iron core and concentric layers that surround a silicate mantle and crust. However, if the meteoroid survives and lands on the surface of the Earth, or parts. In some cases, however, the meteoroid does not completely burn up, and the object actually makes it to Earth’s surface. Usually, the meteoroid is small enough that it gets burned up in the process. They undergo major chemical or physical change, solidifying from a molten state. Most meteoroids that enter the atmosphere burn up completely as meteors. Iron meteorites as the name suggest consisting mainly of iron-based alloy with small amounts of sulfide and carbide minerals.ĭifferentiated meteorites are meteorites that are obtained as a result of melting.